FIELD: ores and rocks grinding. SUBSTANCE: ore is treated with bacterial culture Thiobacillus ferrooxidans at concentration 0.04-0.12 kg biomass/t ore at the ratio solid:liquid = (4-5):1, at 15-35 C, at pH 1.5-2.3 for 3-12 days. EFFECT: improved method of ore grinding. 3 tbl
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